Pontiac Fiero 1988 Service Manual page 1050

AIR CONDITIONING: BLOWER C O N T R O L S
C60, MANUAL
T R O U B L E S H O O T I N G H I N T S
© Try the following checks before doing the
System Diagnosis.
1. Check the HTR A/C Fuse by visual in-
spection.
2. Check that ground G201 is clean and tight.
3. Check that Blower Motor connectors and
Blower Relay are mated correctly and firmly
seated.
• Go to the A/C System Check in 8A-62 for a
guide to normal operation of the entire
A/C
System.
• Go to System Diagnosis for diagnostic tests
of Blower Controls.
S Y S T E M D I A G N O S I S
• Do the tests listed for your symptom in the
Symptom Table below.
• Tests follow the Symptom Table.
S Y M P T O M T A B L E
SYMPTOM FOR DIAGNOSIS
Blower runs all the
time with Ignition
OFF
Replace High Speed
Blower Relay
Blower runs all the
time with Ignition in
RUN
Do Tfest E
Blower will not run
in any mode
Do Tfest A
Do Tfest E
Do Tfest F
No low speed
operation
Do Test C
COMPONENT LOCATION
Page-Figure
A/C Power Relay Front compartment, on RH side of heater-A/C
module
Blower Motor Center of front bulkhead
Blower Resistors Front compartment, lower RH side of heater-A/C
module
Fuse Block Behind LH side of I/P
Fusible Link A RH front of engine compartment, at Battery
Junction Block
High Speed Blower Relay. On RH side of heater-A/C plenum
C100 (34 cavities) LH side of front bulkhead, right of brake master
cylinder.
G201 Behind center of I/P..
S106 Heater-A/C harness, center of front bulkhead . . .
S107 Heater-A/C harness, RH side of front bulkhead. .
S206 Main harness, above LH side of steering column.
S212 Main harness, behind center of dash
201 •11-B
201-•13-A
201-•13-A
201-• 6-D
201-• 4-A
201-•13-A
201- 13-A
201- 6-C
201- 13-A
201-13-A
201- 8-F
201- 6-C
(Continued from previous column)
A : B L O W E R M O T O R T E S T
No high speed
operation
Do Test B
Do Tfest D
High speed operation
only
Do Test B
Do Test D
None of the above
Do Tests A, B, C, D
and E
Measure: VOLTAGE
At: BLOWER MOTOR CONNECTOR
(Disconnected!
Conditions:
© Ignition Switch: RUN
•
A/C
Mode:
VENT
• Blower Switch: HI
(Continued in next column)
(Continued on next page)